Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (6): 109-116.doi: 10.3969/j.issn.1673-8926.2016.06.015

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Application of seismic sedimentology to prediction of beach and bar sand bodies in lacustrine basin: a case study of Jianquanzi member in Y block, Jiuxi Basin

Zhang Wenting1， Pan Shuxin1， Liu Zhenhua1， Zhang Liping1， Li Wei2， Wang Wei2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest， Lanzhou 730020， China； 2. Research Institute of Exploration and Development， PetroChina Yumen Oilfield Company， Jiuquan 735019， Gansu， China
  • Received:2016-03-14 Revised:2016-07-04 Online:2016-11-10 Published:2016-11-10

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Abstract: The beach bar sand bodies have become an important exploration target in lacustrine basins of China. The prediction of beach bar sand bodies is difficult due to its thin bed characters. Under the guidance of seismic sedimentary theory, the techniques of 90° phase shift and stratal slicing were used to identify and characterize the distribution of beach bar sand bodies of Jianquanzi member in Y block of Jiuxi Basin. Based on the comprehensive analysis of core, lithology and logging data, stratal slices were interpreted. The identification signs of beach bar sand bodies were summed up from the aspects of origin, lithology, sedimentary thickness and geophysical response characteristics, and the distribution rule and controlling factors of beach bar sand bodies were discussed. The beach bar sand bodies were developed in lake-bays between braided deltas, and vertically in L3 reservoir group of descending half cycle of fifth-order cycle, and were characterized by thin and multi-row distribution parallel to the shore line. The frequent change of lake level, gentle sedimentary palaeotopography and sufficient supply of source rocks are the main controlling factors for the large area distribution of beach bar sand bodies. The research results show that seismic sedimentology technology is an effective means to predict thin reservoirs and could advantageously guide the fine lithologic reservoir exploration and development. This research could provide reference for the reservoir prediction in other similar areas.

Key words: ancient carbonate rocks, ancient carbonate rocks, effective source rocks, effective source rocks, hydrocarbon potential, hydrocarbon potential, hydrocarbon expulsion, hydrocarbon expulsion

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